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A. OF iq1. <br />a 'fi IBC VISION PLAN 2o18 TRAFFIC STUDY UPDATE - <br />ALTERNATIVES ANALYSIS <br />'S, Final <br />MULTI -MODAL: More than one mode; such as automobile, bus transit, rail rapid transit, and bicycle <br />transportation modes. <br />OFFSET: the time interval in seconds between the beginning of green at one intersection and the beginning of <br />green at an adjacent intersection. <br />PLATOON; A closely grouped component of traffic that is composed of several vehicles moving, or standing <br />ready to move, with clear spaces ahead and behind. <br />ORANGE COUNTY TRANSPORTATION ANALYSIS MODEL (OCTAM): The regional model developed and <br />maintained by OCTA that is the parent model to the City of Irvine subarea model, ITAM. <br />ORIGIN -DESTINATION SURVEY: A survey to determine the point of origin and the point of destination for a <br />given vehicle trip. <br />PASSENGER CAR EQUIVALENTS (PGE): One car is one Passenger car Equivalent. A truck is equal to two or <br />three Passenger car Equivalents in that a truck requires longer to start, goes slower, and accelerates slower. <br />Loaded trucks have a higher Passenger Car Equivalent than empty trucks. <br />PEAK HOUR: The 60 consecutive minutes with the highest number of vehicles. <br />PEAK HOUR FACTOR: the period during which peak hour traffic volume is at its highest. Peak Hour factor is <br />determined by calculating the hourly volume divided by the peak rate of flow within the hour, which is the <br />highest 15 minute interval multiplied by four. <br />PRETIMED SIGNAL: A type of traffic signal that directs traffic to stop and go on a predetermined time <br />schedule without regard to traffic conditions. Also, fixed time signal. <br />PROGRESSION: A term used to describe the progressive movement of traffic through several signalized <br />intersections. <br />SCREEN -LINE: An imaginary line or physical feature across which all trips are counted, normally to verify the <br />validity of mathematical traffic models. <br />SIGNAL CYCLE: The time in seconds required for one complete sequence of signal indications. <br />SIGNAL PHASE: The part of the signal cycle allocated to one or more traffic movements. <br />SIGNIFICANT IMPACT (CEQA): Projects can cause significant impacts by direct physical changes to the <br />environment or by triggering reasonably foreseeable indirect physical changes. Physical changes caused by a <br />project can contribute incrementally to cumulative effects that are significant, even if individual changes <br />resulting from a project are limited. You must determine whether the cumulative impact is significant, as well <br />as whether an individual effect is "cumulatively considerable." This means "the incremental effects of an <br />individual project are significant when viewed in connection with the effects of past projects, the effects of <br />other current projects, and the effects of probable future projects" (CEQA Guidelines Section 15064(h)(1)). <br />...:... <br />:•:;a :........... . . <br />Iteris, Inc. 194 <br />